Okay James' video has an object changing into three colours and I found an article where a drone can do the same. I am still not convinced.

Quote: On Aug. 23, a strange sight baffled locals in the English county of Leicestershire: Dozens of peoplereported seeing mysterious lights hovering in the sky around dusk high above open fields. The hovering lights, which were made up of at least three colors, were silent. They were too small to be any kind of aircraft or helicopters.

A local group of investigators from the Leicestershire UFO Research Society were soon dispatched to the scene. They reported that, "Several witnesses in the area reported observing a strange flying object hovering above the Barwell and Burbage Common areas of the region. Object was said to be carrying blue, red and white lights and behaving strangely."

Local UFO enthusiasts were abuzz with speculation, but after about a week of research the group concluded that the UFO "was in fact an illuminated quadcopter model being flown at dusk in a local park by a model aircraft enthusiast," according to their website.